Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium

Abstract

What is provided is a fluorine-containing ether compound represented by the following formula. R1—R2—O—CH2—R3—CH2—O—R4—R5(R3 is a perfluoropolyether chain; R2 is represented by Formula (2), R4 is represented by Formula (3), R1 and R5 are hydrogen atoms or Formula (4); a and b in Formula (2) are an integer of 0 to 2, c in Formula (2) is an integer of 2 to 5, d and e in Formula (3) are an integer of 0 to 2, f in Formula (3) is an integer of 2 to 5; at least one of b in Formula (2) and e in Formula (3) is 1 or more; and k in Formula (4) is an integer of 3 to 6.)

1 . A fluorine-containing ether compound represented by any of Formulae (1A) to (1P), (2A) to (2P), and (3A) to (3P) 
       
         
           
           
               
               
           
         
         (za in Formula (1A) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zb in Formula (1C) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zc in Formula (1C) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zd in Formula (1D) indicates an average degree of polymerization and represents 0.1 to 30), 
         (ze in Formula (1E) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zf in Formula (1F) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zg in Formula (1G) indicates an average degree of polymerization and represents 0.1 to 30), 
       
       
         
           
           
               
               
           
         
         (zh in Formula (1H) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zi in Formula (1J) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zj in Formula (1J) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zk in Formula (1K) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zl in Formula (1L) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zm in Formula (1M) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zn in Formula (1N) indicates an average degree of polymerization and represents 0.1 to 30), 
         (zp in Formula (1P) indicates an average degree of polymerization and represents 0.1 to 30), 
       
       
         
           
           
               
               
           
         
         (ya in Formula (2A) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yb in Formula (2B) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yc in Formula (2C) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yd in Formula (2D) indicates an average degree of polymerization and represents 0.1 to 30), 
         (ye in Formula (2E) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yf in Formula (2F) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yg in Formula (2Q) indicates an average degree of polymerization and represents 0.1 to 30), 
       
       
         
           
           
               
               
           
         
         (yh in Formula (2H) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yi in Formula (2J) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yj in Formula (2J) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yk in Formula (2K) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yl in Formula (2L) indicates an average degree of polymerization and represents 0.1 to 30), 
         (ym in Formula (2M) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yn in Formula (2N) indicates an average degree of polymerization and represents 0.1 to 30), 
         (yp in Formula (2P) indicates an average degree of polymerization and represents 0.1 to 30), 
       
       
         
           
           
               
               
           
         
         (ma and na in Formula (3A) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mb and nb in Formula (3B) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mc and nc in Formula (3C) indicate an average degree of polymerization and represent 0.1 to 30), 
         (md and nd in Formula (3D) indicate an average degree of polymerization and represent 0.1 to 30), 
         (me and ne in Formula (3E) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mf and nf in Formula (3F) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mg and ng in Formula (3G) indicate an average degree of polymerization and represent 0.1 to 30), 
       
       
         
           
           
               
               
           
         
         (mh and nh in Formula (3H) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mi and ni in Formula (3I) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mj and nj in Formula (3J) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mk and nk in Formula (3K) indicate an average degree of polymerization and represent 0.1 to 30), 
         (ml and nl in Formula (3L) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mm and nm in Formula (3M) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mn and nn in Formula (3N) indicate an average degree of polymerization and represent 0.1 to 30), 
         (mp and np in Formula (3P) indicate an average degree of polymerization and represent 0.1 to 30). 
       
     
     
         2 - 7 . (canceled) 
     
     
         8 . The fluorine-containing ether compound according to  claim 1 ,
 wherein a number average molecular weight thereof is within a range of 500 to 10,000.   
     
     
         9 . A lubricant for a magnetic recording medium comprising:
 the fluorine-containing ether compound according to  claim 1 .   
     
     
         10 . A magnetic recording medium,
 wherein at least a magnetic layer, a protective layer, and a lubricating layer are sequentially provided on a substrate, and   wherein the lubricating layer contains the fluorine-containing ether compound according to  claim 1 .   
     
     
         11 . The magnetic recording medium according to  claim 10 ,
 wherein an average film thickness of the lubricating layer is 0.5 nm to 2.0 nm.